OobsIfaceModem Object that represents an individual modem interface. @OOBS_MODEM_VOLUME_SILENT: @OOBS_MODEM_VOLUME_LOW: @OOBS_MODEM_VOLUME_MEDIUM: @OOBS_MODEM_VOLUME_LOUD: @OOBS_DIAL_TYPE_TONES: @OOBS_DIAL_TYPE_PULSES: @iface: @serial_port: @iface: @Returns: @iface: @volume: @iface: @Returns: @iface: @dial_type: @iface: @Returns: